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Cutting Coroplast with CNC

I have finally got my shopbot up and running so I can play with it. One of the first things I want to do is cut out some Coro shapes in 4mm Coroplast. I have tried several spindle speeds and feed rates but can't seem to get the flute tails to completely cut off. I am using an 1/8" O flute down cut bit. The top and bottom cut fine, the flutes leave small tails. I have tried a straight 2 flute bit as well with no better results.

Anyone out there (Jim?) use their CNC to cut Coro and not leave the flute tails?

Re: Cutting Coroplast with CNC

When I was researching a cnc machine for coroplast I found a few forums which talk about best settings. I think they said fast travel speed. I don't remember which forum I saw it in, just Google it you might find it.

Re: Cutting Coroplast with CNC

I wound up using an O-Flute upcut bit. I only cut one sheet at a time but still have an issue with with small flute tails.
I also got a drag knife and it works pretty well but I am not sure about cutting a butt load of hole with it.. that is going to be a bit thing..

Re: Cutting Coroplast with CNC

Have you tried using a thin cushion layer between your corrugated work and your spoilboard ?

I am not sure how that would help with the flute tails between the top and bottom layers of the Coro. I tried an O-Flute down cut bit and a straight bit but neither really stopped the tails.

I'm guessing I would have a hard time with the vacuum holding the Coro if I did that cushion I would imagine. I remember reading that James uses a piece of Coro on his spoil board, is that what you mean by a "cushion layer"?.